Question

How do the products and reactants of a chemical change compare?

The mass of the products is greater than the mass of the reactants because energy is absorbed by the reaction.
The mass of the products equals the mass of the reactants because energy is not absorbed or given off by the reaction.
The mass of the products is less than the mass of the reactants because energy is given off by the reaction.
The mass of the products equals the mass of the reactants because the same atoms are present throughout the reaction.